Our customer, Karen Hansen, sent this recipe in. It is one of her favorites.
Beat butter with mixer on medium speed for 30 seconds. Beat in 3/4 cup sugar, brown sugar, cream of tartar, baking soda, salt and ground ginger until combined. Beat in eggs and vanilla. Add flour and crystalized ginger. Cover and chill for 1 hour or until dough is easy to handle.
Preheat oven to 375 degrees. Shape dough in 1 1/4 inch balls. Roll in sugar. Place balls 3 inches apart on ungreased cookie sheet. Bake 8 to 10 minutes or till lightly browned. Cool on wire rack.